I have had my 2015 15" Macbook Pro with dedicated AMD graphics for about 3 weeks now, everything about it is brilliant so far, apart from the windows/gaming side of things. I am running Windows 8.1 in Bootcamp. It does have a powerful GPU and it shows, I get high frame rates on F1 2014, The vanishing of Ethan Carter, and F1 2015. I can run these all at 1080p medium graphics. However, I get massive and completely random lag spikes. Huge FPS drops, it can go from around 50-60fps to 15fps just randomly, these games do not do this on my other windows computer. Could it be a driver problem? Minecraft is the only game that does not have this issue, that has a constant fps to it. I would appreciate any help, whether it's a driver or a hardware problem. Thank you.